INSIDE a CPU Heat pipe ?( vapor technology )

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A heat pipe is a heat-transfer device that combines the principles of both thermal conductivity and phase transition to effectively transfer heat between two solid interfaces. ... The vapor then travels along the heat pipe to the cold interface and condenses back into a liquid – releasing the latent heat.The components of a HP are pipe wall and end caps,
a wick structure and a small amount of working fluid. The length of a HP could be divided into three
parts: the evaporator, adiabatic and condenser sections. Heat applied to the evaporator section is
conducted through the pipe wall and wick structure, where the working fluid evaporates. The resulting
vapour pressure drives the vapour to the condenser, where it releases its latent heat of vaporization to
the provided heat sink [2]. The capillary pressure created by the wick pumps the condensed fluid back
to the evaporator section. This process will continue as long as there is a sufficient capillary pressure
to drive the condensate back to the evaporator. The selection of the wick structure could be an
important parameter which depends on several factors: working fluid, pipe material and working
conditions.
For designing a HP for specific application like solar collectors, one of the important elements is the
characterisation of the wick structure, in particular its permeability, the developed capillary pressure
and the effective conductivity [3]. In order to have a large capillary pressure difference, capillary
radius must be small. Permeability must be large in order to have a lower liquid pressure drop, a better
distribution of the liquid and therefore, higher heat transport capability. A large value of effective
thermal conductivity gives a small temperature drop across the wick, which is a favourable condition
for the HP performance.